biased vs unflappable

biased

adj
  • Exhibiting a systematic distortion of results due to a factor not allowed for in its derivation; skewed. 

  • Exhibiting bias; prejudiced. 

  • Angled at a slant. 

  • On which an electrical bias is applied. 

unflappable

adj
  • Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily. 

How often have the words biased and unflappable occurred in a corpus of books? (source: Google Ngram Viewer )